{ "data": { "question": { "questionId": "1460", "questionFrontendId": "1358", "boundTopicId": null, "title": "Number of Substrings Containing All Three Characters", "titleSlug": "number-of-substrings-containing-all-three-characters", "content": "

Given a string s consisting only of characters a, b and c.

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Return the number of substrings containing at least one occurrence of all these characters a, b and c.

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Example 1:

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\nInput: s = "abcabc"\nOutput: 10\nExplanation: The substrings containing at least one occurrence of the characters a, b and c are "abc", "abca", "abcab", "abcabc", "bca", "bcab", "bcabc", "cab", "cabc" and "abc" (again). \n
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Example 2:

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\nInput: s = "aaacb"\nOutput: 3\nExplanation: The substrings containing at least one occurrence of the characters a, b and c are "aaacb", "aacb" and "acb". \n
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Example 3:

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\nInput: s = "abc"\nOutput: 1\n
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Constraints:

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